EP1536242A1 - Dosimètre des champs électromagnetiques - Google Patents

Dosimètre des champs électromagnetiques Download PDF

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Publication number
EP1536242A1
EP1536242A1 EP03027265A EP03027265A EP1536242A1 EP 1536242 A1 EP1536242 A1 EP 1536242A1 EP 03027265 A EP03027265 A EP 03027265A EP 03027265 A EP03027265 A EP 03027265A EP 1536242 A1 EP1536242 A1 EP 1536242A1
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EP
European Patent Office
Prior art keywords
electromagnetic field
antennas
dosimeter according
field dosimeter
antenna
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03027265A
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German (de)
English (en)
Inventor
Heinrich Dr. Eder
Hubertus Maschek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschek Elekronik
Original Assignee
Maschek Elekronik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maschek Elekronik filed Critical Maschek Elekronik
Priority to EP03027265A priority Critical patent/EP1536242A1/fr
Publication of EP1536242A1 publication Critical patent/EP1536242A1/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
    • G01R29/0878—Sensors; antennas; probes; detectors

Definitions

  • the invention relates to an electromagnetic field dosimeter for close-to-the-body Application for frequencies from 80 - 6000 MHz.
  • dosimeter or dose refers to ionizing Radiation on the measurement of an in air or body tissue by charge carriers deposited amount of energy.
  • nonionizing radiation as in Microwave range is present, the warming of the tissue is through Relaxation and dissipation processes in the foreground. Accordingly, will also in the present description the term dose by those in the tissue successive energy absorption defined.
  • the absorbed energy is related to the tissue mass, it is called specific energy (SA), measured in J / kg, or at the corresponding time derivative of the specific energy absorption rate (SAR), which is measured in W / kg.
  • SA specific energy
  • SAR specific energy absorption rate
  • the time summation of the SAR leads to the SA within the measurement period and is called a dose
  • the SAR is practically not directly measurable in the human body. Very well However, the SAR is from the measurement of near the body surface measured field strength determined by simulation calculation.
  • the field strength is also a suitable measure because the Limit values according to the 26th Federal Emission Protection Ordinance (BImSchV) of the Federal Republic of Germany in the unit volts / m are given.
  • the tangential components of the electrical measured at the skin surface and magnetic field strength are in a direct mathematical Related to the SAR occurring at defined depth in the tissue, if one considers the associated frequency, the high-frequency characteristics of the Tissue, as well as the shape of the surface contour of the irradiated body knows. Corresponding calculations are made with a simulation program (Finite Difference Time Domain method or short FDTD method) performed.
  • the return to the SAR can be for certain directions of incidence of the wave also metrologically by the arrangement of a field probe on a tissue equivalent pantom, e.g. according to EN 50361, 06/2002, basic standard for measuring the specific absorption rate (SAR) in relation to the Safety of persons in electromagnetic fields of mobile phones.
  • SAR specific absorption rate
  • the field strength at a defined distance above the body surface determined and then with the same field direction using a field probe the Field strength measured in the underlying tissue-like liquid and from that the SAR is calculated.
  • the surface normal measured with the electromagnetic field dosimeter Component of the electric field strength is in direct with the SAR underlying tissue is initially not directly related.
  • the spatial averaging in the movement of a person and in consequence Multiple reflection usually more or less present isotropically spatial distribution of the field direction as well as the spatial directional distribution
  • the body surface can have at least a statistical relationship between the square average field strength normal component and the medium SAR are produced.
  • the measurement and recording of the field strength at the body part of interest or in the immediate vicinity of it can be considered as the only method with which, for example, the part-body SAR in a constantly changing Field environment can be estimated realistically.
  • the invention is based, the burden of electromagnetic, the task magnetic and electric fields related by a person Electromagnetic field dosimeter compact design and minimized interference Capture measurement.
  • the task is carried out by an electromagnetic field dosimeter to the body Application solved for frequencies of 80 - 6000 MHz, which characterized is that by folding geometrically shortened antennas with Air dielectric and / or solid dielectric at a distance of 1/50 - 1/4 of respective wavelength in a row and / or staggered over a common ground plate are arranged.
  • the antennas used according to the invention can be used as planar antennas or Faltantennen, such as folding monopolies, planar inverted F antennas (English: planar inverted F-antenna - PIFA) be configured.
  • the number of antennas is preferably 2-12.
  • the simulation calculation provides for Falt monopolies according to their Arrangement in the electromagnetic field dosimeter according to the invention a very advantageous directional diagram showing the half-space above the body surface almost uniformly recorded.
  • the dosimeter is small enough to keep the field line distribution around the body not in addition to disturb. It can, for example, on the upper arm or on the head be worn, where it is provided with corresponding holding devices can be.
  • the ground plate is placed directly on the body.
  • the antennas are preferably located at a distance of a tenth of a wavelength from the Ground plate and are so polarized that on the body surface vertical electric field vector or the magnetic Tangential vector is detected.
  • the simulation calculation provides good traceability for this distance on the undisturbed field strength, i. on the field strength without a person.
  • the dielectric is for reasons of lowest possible losses and high Sensitivity preferably air.
  • the antennas are without further Adaptation members only by shaping and arrangement to the impedance adapted to the subsequent circuit.
  • the antennas may be narrowband and / or by means of wiring with variable low-loss reactances, such as varactors, be tunable.
  • the individual mobile radio bands also separated by base station or mobile device, selectively selected become. This comes close to a spectrometer function.
  • the individual antennas so arranged above the ground plane that their narrow sides face each other are directed.
  • the antennas for higher frequencies can save space below the antennas for lower frequencies.
  • This staggered Construction results in a particularly advantageous manner maximum compactness.
  • a particular advantage of the electromagnetic field dosimeter according to the invention consists in the personality of the measurement. So it can now be measured exactly at the place used for the assessment of the readings is of the greatest relevance, namely directly to the person himself Determination of now possible wave exposure data has the individual a value that is personally attributable to him. That way you can the individual fears are prevented by the exposure in the portable radio.
  • Electromagnetic field dosimeter characterized in that in the air dielectric one or more loop antennas between the antennas and the ground plane are arranged. These magnetic loop antennas measure the tangential component of the magnetic field.
  • the arrangement of the loop antennas in the dielectric is particularly space-saving in an advantageous manner.
  • Electromagnetic field dosimeter the ground plate is folded, of their thighs electronic components are included. By this folding receives the structural arrangement of the electromagnetic field dosimeter a special compactness, which in turn for the miniaturization of large Advantage is. At the same time, because of the effective enlargement of the ground plate achieved an increase in sensitivity.
  • the thighs of the Ground plate covered electronic components are preferably the Power supply and the measuring electronics.
  • the storage of the temporal field strength course over a larger one Period, such as a day or a week, allows the extraction of statistical Parameters such as the 50s, 75s, and the 95th percentiles of the statistical Field strength distribution, as well as the mean and the peak value too.
  • the data can be sent to the end of the recording via a data interface to the Transfer the computer and calculate the corresponding parameters there become.
  • an approximate value for the SAR or SA can be derived from the Calculated above.
  • the data is transmitted via an interface using optical fibers or wirelessly via radio or infrared simultaneously with a computer or memory transfer.
  • Fig. 1 shows a schematic representation of an inventive electromagnetic field dosimeter with three folded antennas in side view.
  • Fig. 2 shows the electromagnetic field dosimeter of Fig. 1 in plan view.
  • Fig. 3 shows a schematic representation of an inventive electromagnetic field dosimeter with a special arrangement of different antennas over a folded mass plate in the side view.
  • Ground plate 1 which includes the electronics 2, three folded antennas 3, 4, 5 arranged one behind the other.
  • the ground plate 1 forms a closed housing in which the electronics. 2 is housed.
  • Fig. 3 shows a specific embodiment of the invention, in which the Ground plate 1, which includes the measuring electronics 2, is arranged folded.
  • the Ground plate 1 which includes the measuring electronics 2
  • a grounded, stepped folding monopoly 6 and a shunt-fed directly adjacent to its vertical leg Planar antenna 7 is arranged.
  • PIFA planar inverted F antenna
  • In the space below is a fixed balanced, folded on mass folding monopoly 8 to capture the highest Frequencies arranged.
  • a magnetic loop antenna 9 is arranged.
  • Dining members are each marked with 10.
  • the horizontal legs of the folding antennas 6; 7 are 1.3 cm above the ground plate 1 arranged.
  • the electromagnetic field dosimeter described by way of example in FIG. 3 has Outside dimensions of 8 cm long, 4 cm wide and 2.3 cm high.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Radiation (AREA)
EP03027265A 2003-11-28 2003-11-28 Dosimètre des champs électromagnetiques Withdrawn EP1536242A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03027265A EP1536242A1 (fr) 2003-11-28 2003-11-28 Dosimètre des champs électromagnetiques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03027265A EP1536242A1 (fr) 2003-11-28 2003-11-28 Dosimètre des champs électromagnetiques

Publications (1)

Publication Number Publication Date
EP1536242A1 true EP1536242A1 (fr) 2005-06-01

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Family Applications (1)

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EP03027265A Withdrawn EP1536242A1 (fr) 2003-11-28 2003-11-28 Dosimètre des champs électromagnetiques

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EP (1) EP1536242A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU206778U1 (ru) * 2020-07-10 2021-09-28 Общество с ограниченной ответственностью "Лазер Ай" Мобильный СВЧ дозиметр
RU215126U1 (ru) * 2022-01-10 2022-11-30 Общество с ограниченной ответственностью "Лазер Ай" (ООО "Лазер Ай) Малошумящий мобильный СВЧ-дозиметр

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4539567A (en) * 1983-09-12 1985-09-03 Micrometrics, Ltd. Microwave monitor
DE3606326A1 (de) * 1986-02-27 1987-09-03 Volkrodt Wolfgang Mikrowellensmog-detektor
US5943020A (en) * 1996-03-13 1999-08-24 Ascom Tech Ag Flat three-dimensional antenna
US20010050636A1 (en) * 1999-01-26 2001-12-13 Martin Weinberger Antenna for radio-operated communication terminal equipment
US6380895B1 (en) * 1997-07-09 2002-04-30 Allgon Ab Trap microstrip PIFA
US20020070902A1 (en) * 1998-01-16 2002-06-13 Greg Johnson Single or dual band parasitic antenna assembly
US20030201942A1 (en) * 2002-04-25 2003-10-30 Ethertronics, Inc. Low-profile, multi-frequency, multi-band, capacitively loaded magnetic dipole antenna

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4539567A (en) * 1983-09-12 1985-09-03 Micrometrics, Ltd. Microwave monitor
DE3606326A1 (de) * 1986-02-27 1987-09-03 Volkrodt Wolfgang Mikrowellensmog-detektor
US5943020A (en) * 1996-03-13 1999-08-24 Ascom Tech Ag Flat three-dimensional antenna
US6380895B1 (en) * 1997-07-09 2002-04-30 Allgon Ab Trap microstrip PIFA
US20020070902A1 (en) * 1998-01-16 2002-06-13 Greg Johnson Single or dual band parasitic antenna assembly
US20010050636A1 (en) * 1999-01-26 2001-12-13 Martin Weinberger Antenna for radio-operated communication terminal equipment
US20030201942A1 (en) * 2002-04-25 2003-10-30 Ethertronics, Inc. Low-profile, multi-frequency, multi-band, capacitively loaded magnetic dipole antenna

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KUSTER N ET AL: "ENERGY ABSORPTION MECHANISM BY BIOLOGICAL BODIES IN THE NEAR FIELD OF DIPOLE ANTENNAS ABOVE 300 MHZ", IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, IEEE INC. NEW YORK, US, vol. 41, no. 1, 1 February 1992 (1992-02-01), pages 17 - 23, XP000297037, ISSN: 0018-9545 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU206778U1 (ru) * 2020-07-10 2021-09-28 Общество с ограниченной ответственностью "Лазер Ай" Мобильный СВЧ дозиметр
RU215126U1 (ru) * 2022-01-10 2022-11-30 Общество с ограниченной ответственностью "Лазер Ай" (ООО "Лазер Ай) Малошумящий мобильный СВЧ-дозиметр

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